For sale: giant lab "gantries," slightly used, FOB Indiana

Indiana U is selling off a huge lot of lab equipment, including these space-pod-looking gantries. Winning bidder is responsible for dismantling and shipping. "To give someone an idea of how large these are, there are two pits that they sit in. Each of the pits are 28'x35'x10' deep."

Hackaday doesn't think these are flight sims, but no one is quite sure what they are. Your theories?

Update: Mystery solved!

randomness: "These are part of a medical radiation treatment system. Here is a link to a patent diagram of a similar assembly. This sits at the end of the beamline, and allows the aiming/positioning of the beam in the right location."

Gantry [Govdeals]

(via Hackaday)